Symmetricom Time Server User Manual download pdf (Page 28)

2-14 TimeVault™ User’s Manual 6000-100Ch2.fm Rev. D

Chapter 2: Installation and Start-Up Site Preparation

extend mast height to prevent multipath cancellation. The

antenna should be at least 3.28 ft (1.0 m) from a reflecting

surface. The figure at the right

shows the recommended

mounting of the antenna to the mast.

2.1.5 GPS Window-Mounted Antenna (140-619) Installation

The GPS Window-Mounted Antenna is intended

for use with products featuring ‘single satellite

timing,’ (available with firmware version 8 and

above). Customers with units running earlier

firmware versions should upgrade to the current

version. Information on upgrading is available at

www.truetime.net/downloads.html.

Window mounted antennas have a restricted view

of the sky, yielding intermittent satellite coverage.

With single satellite timing, a network time server can synchronize with individual GPS

satellites as they pass through the antenna’s field of view.

Placing the Window Antenna

Select the window with the best unobstructed view of the sky. For equivalent views, select

the window with the best orientation. The orientations, in order of preference, are as

follows:

1. Equator-facing (e.g., South, for users in the Northern hemisphere.)

2. East/West-facing

3. Polar-facing (e.g., North, for users in the Northern hemisphere.)

Note: Regardless of orientation, use the window with the best view of the sky.

Mount the antenna on the lower part of the window, where it has the best upward

visibility, by pressing the suction cup onto the window. Make sure the window and suction

cup surfaces are clean. Note that some windows have metallic glazing that blocks GPS

signals: this prevents GPS receivers from tracking satellites and determining the time.

12:00 NOON

Best W indow

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Symmetricom Time Server User Manual Page 28